<template>
    <div class="example">
        <button @click ="addCount">count++</button>{{count}}
    </div>
</template>
<script>
export default {
    data() {
        return {
            count: 0
        }
    },
    methods: {
        addCount(){
            this.count++;
        }
    }
}
</script>

<style>
.example {
    color:red;
}
</style>